Chapter 12, Problem 16QRT

(a)

Interpretation Introduction

Interpretation:

The equilibrium constant expression for the reaction ${\text{2H}}_{\text{2}}{\text{O}}_{\text{2(g)}}\rightleftharpoons {\text{ 2H}}_{\text{2}}{\text{O}}_{\text{(g)}}{\text{ + O}}_{\text{2(g)}}$ has to be written.

Concept Introduction:

Equilibrium constant: At equilibrium the ratio of products to reactants (each raised to the power corresponding to its stoichiometric coefficient) has a constant value, K

For a general reaction,

  $\text{aA+bB}\rightleftarrows \text{cC+dD}$

  $\text{Equilibrium}\text{constant}\text{K}\text{=}\frac{{\left[\text{C}\right]}^{\text{c}}{\left[\text{D}\right]}^{\text{d}}}{{\left[\text{A}\right]}^{\text{a}}{\left[\text{B}\right]}^{\text{b}}}$

The concentration of solids and pure liquids do not change, so their concentration terms are not included in the equilibrium constant expression.

(b)

Interpretation Introduction

Interpretation:

The equilibrium constant expression for the reaction ${\text{PCl}}_{\text{3}}{}_{\text{(g)}}{\text{ + Cl}}_{\text{2}}{}_{\text{(g)}}\rightleftharpoons {\text{PCl}}_{\text{5(g)}}$ has to be written.

Concept Introduction:

Refer part (a) for concept.

(c)

Interpretation Introduction

Interpretation:

The equilibrium constant expression for the reaction ${\text{SiO}}_{\text{2(s)}}{\text{ + 3C}}_{\text{(s)}}\rightleftharpoons {\text{ SiC}}_{\text{(s)}}{\text{ + 2CO}}_{\text{(g)}}$ has to be written.

Concept Introduction:

Refer part (a) for concept.

(d)

Interpretation Introduction

Interpretation:

The equilibrium constant expression for the reaction ${\text{H}}_{\text{2(g)}}\text{ + }\frac{1}{8}{\text{S}}_{\text{8}}{}_{\text{(s)}}\rightleftharpoons {\text{ H}}_{\text{2}}{\text{S}}_{\text{(g)}}$ has to be written.

Concept Introduction:

Refer part (a) for concept.